package cn.ssm.filter;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import cn.ssm.util.Constans;

/**
 * 登录过滤器
 * @author lenovo
 *
 */
public class LoginFilter implements Filter{

	@Override
	public void destroy() {
		
	}

	@Override
	public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
			throws IOException, ServletException {
		HttpServletRequest  httpServletRequest = (HttpServletRequest) request;
		Object admin = httpServletRequest.getSession().getAttribute(Constans.LOGIN_KEY);
		if(admin != null){//登录验证admin != null
			chain.doFilter(request, response);
		}else{//用户未登录，或者session域失效
			HttpServletResponse httpServletResponse = (HttpServletResponse)response;
			httpServletResponse.sendRedirect("/moviesMaven/toLogin.html");
		}
	}

	@Override
	public void init(FilterConfig arg0) throws ServletException {
		
	}


}
